Patent · US Expired

Process and apparatus for electrodialysis of an alkali sulfate containing aqueous solution

US5294316A · kind A · utility

4Cited by

7References

3Claims

0Family size

Assignee

LENZING AKTIENGESELLSCHAFT · AT

Inventors

Heinrich Schmidt · Düsseldorf, DE
Christoph Boxan · Lenzing, AT
Arnold Verwanger · Neumarkt am Wallersee, AT
Reinhard Holzinger · Birkenfeld, DE
Hans Kalleitner · Neumarkt am Wallersee, AT
Jamal Hadi Salim · Ottawa, CA

Key dates

Filing date	Feb 9, 1993
Grant date	Mar 15, 1994
Priority date	—
Expiry date	Feb 9, 2013

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01B17/74
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

There is disclosed a process for the electrodialysis of alkali sulfate-containing aqueous solutions in stages, by conducting these solutions through a plurality of electrodialytic cells operating in series. The electrodialytic cells include acid and base compartments and a cation exchange membrane. The alkali sulfate-containing aqueous solutions exclusively are conducted through acid compartments of the electrodialytic cells. The electrodialytic cells exclusively possess cation exchange membranes in their interiors and are delimited by bipolar ion exchange membranes.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.